Beers Sisters Lake Reservoir Report

Last Updated: December 5, 2025

Beers Sisters Lake, located in Jefferson County, Colorado, is a picturesque reservoir primarily used for irrigation purposes.


°F

°F

mph

Wind

%

Humidity

Summary

Constructed in 1966, this Earth dam stands at a height of 20 feet with a hydraulic height of 15 feet, offering a maximum storage capacity of 83 acre-feet. The dam, designed by Dale H. Rea and W.W. Wheeler, spans 750 feet in length and covers an area of 8 acres, making it a vital water source in the region.

With a spillway type of "Uncontrolled" and a spillway width of 43 feet, Beers Sisters Lake has a significant hazard potential but is currently assessed to be in a satisfactory condition. The dam has a moderate risk rating of 3 and is inspected regularly, with the last assessment conducted in June 2020. While the primary purpose of the reservoir is irrigation, it also offers recreational opportunities for locals and visitors to enjoy.

Managed by the local government and regulated by the Colorado Division of Water Resources, Beers Sisters Lake plays a crucial role in water resource management in the area. With its strategic location along the South Platte River, this reservoir serves as a vital water source for agricultural activities and contributes to the overall environmental health of the region. Its rich history and important functions make it a significant landmark for water resource and climate enthusiasts to explore and appreciate.

Year Completed

1966

Dam Length

750

Dam Height

20

River Or Stream

S. PLATTE RIVER-TR

Primary Dam Type

Earth

Surface Area

8

Hydraulic Height

15

Nid Storage

83

Structural Height

27

Hazard Potential

Significant

Nid Height

27
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.